package com.example.onlinemusic.controller;

import com.example.onlinemusic.mapper.LoveMusicMapper;
import com.example.onlinemusic.mapper.MusicMapper;
import com.example.onlinemusic.model.Music;
import com.example.onlinemusic.model.User;
import com.example.onlinemusic.tools.Constant;
import com.example.onlinemusic.tools.ResponseBodyMessage;
import org.apache.ibatis.binding.BindingException;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.http.ResponseEntity;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.multipart.MultipartFile;

import javax.annotation.Resource;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpSession;
import java.io.File;
import java.io.IOException;
import java.nio.file.Files;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.List;

@RestController
@RequestMapping("/music")
public class MusicController {

    @Value("${music.local.path}")
    private String SAVE_PATH;

    @Autowired
    private MusicMapper musicMapper;

    @Resource
    private LoveMusicMapper loveMusicMapper;

    @RequestMapping("/upload")
    public ResponseBodyMessage<Boolean> insertMusic(@RequestParam String singer,
                                                    @RequestParam("filename") MultipartFile file,
                                                    HttpServletRequest request){
        // 1. 检查是否登录了
        HttpSession httpSession = request.getSession(false);
        if(httpSession == null || httpSession.getAttribute(Constant.USERINFO_SESSION_KEY) == null) {
            System.out.println("没有登陆！");
            return new ResponseBodyMessage<>(-1, "请登录后上传", false);
        }
        String fileNameAndType = file.getOriginalFilename();

        System.out.println("fileNameAndType: " + fileNameAndType);

        String path = SAVE_PATH + fileNameAndType;

        File dest = new File(path);

        if(!dest.exists()) {
            dest.mkdirs();
        }

        try {
            file.transferTo(dest);
            // return new ResponseBodyMessage<>(0, "上传成功！",true);
        } catch (IOException e) {
            e.printStackTrace();
            return new ResponseBodyMessage<>(-1,"服务器上传失败！", false);
        }

        // 进行数据库上传
        // 1. 准备数据  2. 调用insert
        int index = fileNameAndType.lastIndexOf(".");
        String title = fileNameAndType.substring(0,index);

        User user = (User)httpSession.getAttribute(Constant.USERINFO_SESSION_KEY);
        int userId = user.getId();

        // 1. 播放音乐->http请求
        String url = "/music/get?path=" + title;

        SimpleDateFormat sf = new SimpleDateFormat("yyyy-MM-dd");
        String time = sf.format(new Date());

        try {
            int ret = 0; // insert返回的是受影响的行数
            ret = musicMapper.insert(title, singer, time, url, userId);
            if (ret == 1) {
                System.out.println("上传成功！");
                return new ResponseBodyMessage<>(0, "上传成功！",true);
            } else {
                return new ResponseBodyMessage<>(-1, "数据库上传失败！",false);
            }
        } catch (BindingException e) {
            dest.delete();
            return new ResponseBodyMessage<>(-1, "数据库上传失败！",false);
        }


    }

    @RequestMapping("/get")
    public ResponseEntity<byte[]> func(String path) {
        File file = new File(SAVE_PATH+path);
        byte[] a = null;
        try {
            a = Files.readAllBytes(file.toPath());
            if(a == null) {
                return ResponseEntity.badRequest().build();
            }
            return ResponseEntity.ok(a);
        } catch (IOException e) {
            e.printStackTrace();
        }
        return ResponseEntity.badRequest().build();
    }

    /**
     * 删除单个音乐
     */
    @RequestMapping("/delete")
    public ResponseBodyMessage<Boolean> deleteMusicById(String id) {
        // 1. 先检查这个音乐是不是存在的
        int iid = Integer.parseInt(id);
        // 2. 如果存在要进行删除
        Music music = musicMapper.findMusicById(iid);
        if(music == null) {
            System.out.println("没有这个id的音乐");
            return new ResponseBodyMessage<>(-1, "没有你要删除的音乐",false);
        } else {
            // 2.1 删除数据库
            int ret = musicMapper.deleteMusicById(iid);
            if(ret == 1) {
                // 2.2 删除服务器上的数据
                int index = music.getUrl().lastIndexOf("=");
                String fileName = music.getUrl().substring(index+1);

                File file = new File(SAVE_PATH + fileName + ".mp3");
                System.out.println("当前的路径" + file.getPath() );

                if(file.delete()) {
                    // 同步删除lovemusic表当中的这个音乐
                    loveMusicMapper.deleteLoveMusicByMusicId(iid);
                    return new ResponseBodyMessage<>(0, "服务器当中的音乐删除成功！",true);
                } else {
                    return new ResponseBodyMessage<>(-1, "服务器当中的音乐删除失败！",false);
                }
            } else {
                return new ResponseBodyMessage<>(-1,"数据库当中的音乐没有删除成功",false);
            }

        }
    }

    /**
     * 批量进行删除
     */
    @RequestMapping("/deleteSel")
    public ResponseBodyMessage<Boolean> deleteSelMusic(@RequestParam("id[]") List<Integer> id) {

        System.out.println("打印前端传递的id: " + id);
        int sum = 0;
        for (int i = 0; i < id.size(); i++) {
            int musicId = id.get(i);

            Music music = musicMapper.findMusicById(musicId);
            if(music == null) {
                System.out.println("没有这个id的音乐");
                return new ResponseBodyMessage<>(-1, "没有你要删除的音乐", false);
            }
            int ret = musicMapper.deleteMusicById(musicId);
            if(ret == 1) {
                // 2.2 删除服务器上的数据
                int index = music.getUrl().lastIndexOf("=");
                String fileName = music.getUrl().substring(index + 1);

                File file = new File(SAVE_PATH + fileName + ".mp3");

                if(file.delete()) {
                    // 同步删除lovemusic表当中的这个音乐
                    loveMusicMapper.deleteLoveMusicByMusicId(musicId);
                    sum += ret;
                    //return new ResponseBodyMessage<>(0, "服务器当中的音乐删除成功！",true);
                } else {
                    return new ResponseBodyMessage<>(-1, "服务器当中的音乐删除失败！",false);
                }
            } else {
                return new ResponseBodyMessage<>(-1,"数据库当中的音乐没有删除成功",false);
            }
        }
        if(sum == id.size()) {
            System.out.println("整体删除成功");
            return new ResponseBodyMessage<>(0, "音乐删除成功！",true);
        } else {
            System.out.println("整体删除失败");
            return new ResponseBodyMessage<>(0, "音乐删除失败！",false);
        }


    }

    @RequestMapping("/findmusic")
    public ResponseBodyMessage<List<Music>> findMusic(@RequestParam(required = false) String musicName) {
        List<Music> musicList = null;
        if(musicName != null) {
            musicList = musicMapper.findMusicByName(musicName);
        } else{
            musicList = musicMapper.findMusic();
        }

        return  new ResponseBodyMessage<>(0, "查询到了所有的音乐",musicList);
    }
}
